NEET UG 2011 — Animal Kingdom

Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception?

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?

The figure shows four animals $(A),(B),(C),(D)$. Select the correct answer with respect to a common characteristics of two these animals. 

In which one of the following the genus name, its two characters and its class/phylum are correctly matched?